The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 1996
Filed:
Nov. 24, 1993
Hiroyasu Muto, Tokyo, JP;
NEC Corporation, , JP;
Abstract
Supplied with a transmitted signal defined by a sequence signal vectors each of which has a phase variation equal to a predetermined phase variation. A demodulator (11) quadrature demodulates a transmitted signal into a demodulated signal with reference to a standard signal of a standard frequency. The demodulated signal is defined by a sequence of demodulated vectors. An A/D section (21, 22) samples the demodulated vectors at a predetermined sampling rate to quantize the demodulated vectors into quantized vectors. A signal processor (31) compounds a composite vector from the quantized vectors within a predetermined number of the quantized vectors. The signal processor calculates a phase difference between the composite vector and a predetermined vector to detect a frequency error between the standard frequency and a carrier frequency of the transmitted signal.